Bug 1665357 - Ensure DPI_AWARENESS_CONTEXT is defined r=mhowell

This is currently failing the tier 2 MinGW-Clang builds, complaining
that DPI_AWARENESS_CONTEXT is not defined. Accordingly I pulled out the
logic from WinUtils.h which ensures it is defined into a shared header.

Differential Revision: https://phabricator.services.mozilla.com/D90467

mozglue/misc/EarlyBlankWindow.cpp

@@ -11,6 +11,7 @@
 #include "mozilla/Assertions.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/glue/Debug.h"
+#include "mozilla/WindowsDpiAwareness.h"
 #include "mozilla/WindowsVersion.h"
 
 namespace mozilla {
@@ -59,12 +60,6 @@ StretchDIBitsProc sStretchDIBits = NULL;
 typedef HBRUSH(WINAPI* CreateSolidBrushProc)(COLORREF);
 CreateSolidBrushProc sCreateSolidBrush = NULL;
 
-#if WINVER < 0x0605
-WINUSERAPI DPI_AWARENESS_CONTEXT WINAPI GetThreadDpiAwarenessContext();
-WINUSERAPI BOOL WINAPI AreDpiAwarenessContextsEqual(DPI_AWARENESS_CONTEXT,
-                                                    DPI_AWARENESS_CONTEXT);
-#endif /* WINVER < 0x0605 */
-
 static uint32_t sWindowWidth;
 static uint32_t sWindowHeight;
 static double sCSSToDevPixelScaling;

mozglue/misc/WindowsDpiAwareness.h

@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#ifndef WindowsDpiAwareness_h_
+#define WindowsDpiAwareness_h_
+
+#include <windows.h>
+
+#if !defined(DPI_AWARENESS_CONTEXT_DECLARED) && \
+    !defined(DPI_AWARENESS_CONTEXT_UNAWARE)
+
+DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
+
+typedef enum DPI_AWARENESS {
+  DPI_AWARENESS_INVALID = -1,
+  DPI_AWARENESS_UNAWARE = 0,
+  DPI_AWARENESS_SYSTEM_AWARE = 1,
+  DPI_AWARENESS_PER_MONITOR_AWARE = 2
+} DPI_AWARENESS;
+
+#  define DPI_AWARENESS_CONTEXT_UNAWARE ((DPI_AWARENESS_CONTEXT)-1)
+#  define DPI_AWARENESS_CONTEXT_SYSTEM_AWARE ((DPI_AWARENESS_CONTEXT)-2)
+#  define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE ((DPI_AWARENESS_CONTEXT)-3)
+
+#  define DPI_AWARENESS_CONTEXT_DECLARED
+#endif  // (DPI_AWARENESS_CONTEXT_DECLARED)
+
+#if WINVER < 0x0605
+WINUSERAPI DPI_AWARENESS_CONTEXT WINAPI GetThreadDpiAwarenessContext();
+WINUSERAPI BOOL WINAPI AreDpiAwarenessContextsEqual(DPI_AWARENESS_CONTEXT,
+                                                    DPI_AWARENESS_CONTEXT);
+#endif /* WINVER < 0x0605 */
+typedef DPI_AWARENESS_CONTEXT(WINAPI* SetThreadDpiAwarenessContextProc)(
+    DPI_AWARENESS_CONTEXT);
+typedef BOOL(WINAPI* EnableNonClientDpiScalingProc)(HWND);
+typedef int(WINAPI* GetSystemMetricsForDpiProc)(int, UINT);
+
+#endif

mozglue/misc/moz.build

@@ -28,6 +28,7 @@ if CONFIG['OS_ARCH'] == 'WINNT':
         'EarlyBlankWindow.h',
         'StackWalk_windows.h',
         'TimeStamp_windows.h',
+        'WindowsDpiAwareness.h',
     ]
 
 SOURCES += [

widget/windows/WinUtils.h

@@ -36,6 +36,7 @@
 #include "mozilla/Attributes.h"
 #include "mozilla/EventForwards.h"
 #include "mozilla/UniquePtr.h"
+#include "mozilla/WindowsDpiAwareness.h"
 
 /**
  * NS_INLINE_DECL_IUNKNOWN_REFCOUNTING should be used for defining and
@@ -77,35 +78,6 @@ class nsWindow;
 class nsWindowBase;
 struct KeyPair;
 
-#if !defined(DPI_AWARENESS_CONTEXT_DECLARED) && \
-    !defined(DPI_AWARENESS_CONTEXT_UNAWARE)
-
-DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);
-
-typedef enum DPI_AWARENESS {
-  DPI_AWARENESS_INVALID = -1,
-  DPI_AWARENESS_UNAWARE = 0,
-  DPI_AWARENESS_SYSTEM_AWARE = 1,
-  DPI_AWARENESS_PER_MONITOR_AWARE = 2
-} DPI_AWARENESS;
-
-#  define DPI_AWARENESS_CONTEXT_UNAWARE ((DPI_AWARENESS_CONTEXT)-1)
-#  define DPI_AWARENESS_CONTEXT_SYSTEM_AWARE ((DPI_AWARENESS_CONTEXT)-2)
-#  define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE ((DPI_AWARENESS_CONTEXT)-3)
-
-#  define DPI_AWARENESS_CONTEXT_DECLARED
-#endif  // (DPI_AWARENESS_CONTEXT_DECLARED)
-
-#if WINVER < 0x0605
-WINUSERAPI DPI_AWARENESS_CONTEXT WINAPI GetThreadDpiAwarenessContext();
-WINUSERAPI BOOL WINAPI AreDpiAwarenessContextsEqual(DPI_AWARENESS_CONTEXT,
-                                                    DPI_AWARENESS_CONTEXT);
-#endif /* WINVER < 0x0605 */
-typedef DPI_AWARENESS_CONTEXT(WINAPI* SetThreadDpiAwarenessContextProc)(
-    DPI_AWARENESS_CONTEXT);
-typedef BOOL(WINAPI* EnableNonClientDpiScalingProc)(HWND);
-typedef int(WINAPI* GetSystemMetricsForDpiProc)(int, UINT);
-
 namespace mozilla {
 enum class PointerCapabilities : uint8_t;
 #if defined(ACCESSIBILITY)